US6968113B2 - Optical fiber sealing - Google Patents

Optical fiber sealing Download PDF

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Publication number
US6968113B2
US6968113B2 US10/475,768 US47576803A US6968113B2 US 6968113 B2 US6968113 B2 US 6968113B2 US 47576803 A US47576803 A US 47576803A US 6968113 B2 US6968113 B2 US 6968113B2
Authority
US
United States
Prior art keywords
strips
sealing
container
cable
fibres
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US10/475,768
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English (en)
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US20040136678A1 (en
Inventor
Sam Leeman
Jan Watte
Walter Mattheus
Peter Van Overmeir
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commscope Connectivity Belgium BVBA
Original Assignee
Tyco Electronics Raychem BVBA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tyco Electronics Raychem BVBA filed Critical Tyco Electronics Raychem BVBA
Assigned to TYCO ELECTRONICS RAYCHEM NV reassignment TYCO ELECTRONICS RAYCHEM NV ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEEMAN, SAM, MATTHEUS, WALTER, WATTE, JAN, VAN OVERMEIR, PETER
Publication of US20040136678A1 publication Critical patent/US20040136678A1/en
Priority to US11/227,581 priority Critical patent/US7046901B2/en
Application granted granted Critical
Publication of US6968113B2 publication Critical patent/US6968113B2/en
Priority to US11/377,147 priority patent/US7149403B2/en
Assigned to TYCO ELECTRONICS RAYCHEM BVBA reassignment TYCO ELECTRONICS RAYCHEM BVBA CHANGE OF NAME/CONVERSION Assignors: TYCO ELECTRONICS RAYCHEM NV
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4248—Feed-through connections for the hermetical passage of fibres through a package wall

Definitions

  • the present invention relates to optical fibre sealing. More in particular, the present invention relates to a method of and a device for sealingly enclosing a space into which one or more optical fibres or cables are fed.
  • optical split ratio of optical splitters may be influenced by the presence of moisture, and in optical connectors moisture may lead to increased losses.
  • the sealing of optical components against moisture and other environmental influences, in other words environmental sealing, is therefore highly desirable.
  • WO 94/18815 discloses a casing for flexibly enclosing electronic circuitry.
  • the casing comprises a laminate consisting of metal and plastic sheets. Two sheets of laminate are joined to form an envelope in which electronic circuitry may be accommodated. Electrical conductors pass through the joint region of the laminate.
  • optical fibres unlike electrical conductors such as copper wires, should not be passed through the joint region of the laminate without additional measures. Copper wires (or other electrical conductors) may be bent under almost any angle without affecting their conductive properties. Optical fibres however, while being more flexible than copper wires, should not be bent under the minimum bending radius at which light losses occur (usually approximately 3 cm), and certainly not under the minimum bending radius at which they suffer permanent damage. In addition, optical fibres are made of glass which has different sealing properties to metal.
  • the present invention provides an assembly sealingly enclosing a space into which one or more optical fibres and/or optical cables is or are fed, the assembly comprising a container having an opening, one or more optical fibres and/or cables extending throughout the said opening into the said container, and a sealing member sealingly enclosing the said fibres or cables and sealing the said opening, the sealing member comprising two sealing strips heat-and/or pressure-sealed together around the said fibres and/or cables extending between the said strips and heat-and/or pressure-sealed to the container to seal the said opening onto the said strips.
  • the present invention also provides a method of sealingly enclosing a space into which one or more optical fibres and/or optical cables is or are fed, which method comprises the steps of providing a container having an opening, providing two sealing strips, accommodating a portion of one or more optical fibres and/or cables between the two sealing strips, applying heat and/or pressure to the strips so as to produce a sealing member which sealingly encloses the fibres and/or cables, placing the sealing member in said opening, and applying heat and/or pressure to the container so as to seal said opening onto the strips.
  • the container could be provided with the sealing strips pre-sealed to opposed surfaces of the opening, ready to receive and seal around the fibres and/or cables.
  • the fibres are supported over part of their length, thus preventing excessive bending of the fibres and facilitating their handling.
  • a good seal can be obtained by applying heat/and or pressure.
  • an excellent seal can be obtained.
  • the edges of the container opening are sealed onto the strips when the strips are sealed together.
  • the container may consist of, for example, two sheets of laminate, the edges of which may not be joined until these sheets are sealed onto the sealing strips.
  • a tubular container may be used having openings at both ends, one or both of which may be provided with a pair of sealing strips.
  • the sealing strips are preferably made of plastic, so that they soften when heat is applied. This allows the optical fibres to be embedded in the pair of strips.
  • the sealing strips are provided with a layer of hot-melt adhesive.
  • This adhesive may be applied on the sides of the strips facing the other strips, and/or on the sides facing the edges of the container opening.
  • the said portion of the at least one optical fibre extends substantially transversely to the longitudinal direction of the strips. This is particularly advantageous when a plurality of optical fibres is accommodated, which can be arranged in parallel along the length of the strips.
  • the strips have an effective width of at least 1 cm, preferably at least 2 cm.
  • the width of the strips defines the maximum effective sealing length of the optical fibres and a minimum sealing of a few millimetres is required. It will be understood that the greater the overlapping width of the strips, the greater the effective sealing length of the fibres.
  • the strips preferably have sufficient rigidity to resist bending of the optical fibres. Although rigid strips may be used, strips having some flexibility are preferred. In the case of plastic strips, a thickness of about 0.2 to 2.0 mm is preferred, although other thicknesses are also possible. The length of the strips may be determined by the size of the container opening.
  • the present invention further provides a device for sealingly enclosing a space into which at least one optical fibres if fed, the device being produced by the method as defined above.
  • the present invention further provides a kit-of-parts for forming such a device.
  • the device of the present invention comprises a container or container parts, and two sealing strips for accommodating optical fibres between them.
  • FIG. 1 shows, in cross-sectional view, a device for enclosing electronic circuitry according to the Prior Art
  • FIGS. 2 a and 2 b show, in cross-sectional view, how optical fibres are sealed in accordance with the present invention
  • FIG. 3 shows, in perspective, a tray for optical components in accordance with the present invention
  • FIG. 4 shows, in perspective, the tray of FIG. 3 with sealed fibres
  • FIG. 5 shows, in perspective, the tray of FIGS. 3 and 4 enclosed in a container.
  • FIG. 6 shows, in perspective, the sealing strips in use on buffered fibres
  • FIG. 7 shows, in perspective, the sealing strips in use on a ribbon cable
  • FIG. 8 shows, in perspective, the sealing strips in use on a reinforced cable.
  • the Prior Art device 20 shown in FIG. 1 is constituted by a flexible bag which consists of two laminated sheets 21 . The sheets are joined in joint regions 22 . A printed circuit board (PCB) 25 is contained in the device 20 . Electrical conductors 26 pass directly through one of the joint regions 22 without any additional support.
  • PCB printed circuit board
  • FIGS. 2 a and 2 b It is schematically shown in FIGS. 2 a and 2 b how optical fibres are sealed in accordance with the present invention.
  • Fibres 11 are accommodated between sealing strips 3 and 4 , as shown in FIG. 2 a .
  • the sealing strips 3 , 4 and the fibres 11 sandwiched between them are accommodated between two plates 13 and 14 .
  • Heat and/or pressure, preferably both is applied, causing the sealing strips 3 , 4 to change shape and to sealingly surround the fibres 11 .
  • the sealing strips 3 , 4 may melt slightly, resulting in a good mutual bond and a good bonding with the optical fibres. An even better bonding with the fibres may be obtained when their cladding is removed prior to being accommodated between the sealing strips.
  • the fibres 11 and the sealing strips 3 , 4 extend in parallel over some distance perpendicular to the plane of the drawing. The portion of the length of the fibres sealingly enclosed by both strips defines the effective sealing length of the fibres.
  • the tray 6 shown in FIG. 3 is suitable for accommodating optical components and/or optical circuitry.
  • Optical fibres 11 lead into the tray.
  • Underneath the tray 6 a (relatively rigid) sheet 7 is mounted underneath the tray 6 .
  • the sheet 7 extends beyond the tray 6 so as to leave a first strip 3 which supports the optical fibres.
  • a second strip 4 is placed upon the first strip 3 so as to enclose the fibres 11 in the manner shown in FIG. 2 .
  • the second strip 4 may have a smaller width than the first strip 3 , leaving a transition region 9 which serves to accommodate any difference in height between the first strip 3 and the plane of the tray 6 .
  • suitable bend control means (not shown) may be located.
  • the container 1 shown in FIG. 5 is a flexible bag, preferably made of an aluminium/polyethylene laminate. Laminates of this kind are, for example, used in Raychem's TDUXTM products, as disclosed in EP 0 579 641.
  • the bag has an opening 2 , the edges of which are sealed at the strips 3 , 4 thus providing an excellent seal.
  • the resulting device 10 sealingly encloses the space defined by the tray 6 and may contain optical components and/or an entire optical circuit.
  • FIGS. 6 , 7 and 8 show the way various fibre optic cable constructions may be terminated in a sealing strip according to the invention to achieve both a good moisture barrier level, mechanical protection and strain relief
  • FIG. 6 shows secondary coated fibre (buffer tube) 60 that is embedded in the polymer strip 62 .
  • This buffer tube can be unfilled or filled with grease or silicone sealant for example. To create an improved sealing level the buffer tube 60 is stripped off over a certain distance.
  • the transition point between buffer 60 and primary coated fibre 64 is embedded in the strip to prevent moisture from leaking through the secondary tube 60 .
  • the primary coating may optionally be removed to expose the uncoated fibre 66 .
  • a second benefit is the mechanical protection of the transition area that is more fragile to mechanical movement.
  • a third benefit of this embedded termination is a strain relief function when a fibre is pulled.
  • a ribbon is a flat cable assembly of several optical fibres 72 . These are primary coated fibres that are over coated to group these fibres. This ribbon coating is often not strongly bonded to the primary coated fibres to allow removal of the coating for better handling of single fibres. Several moisture leak paths can be present between the over coating and the fibres. To achieve a good sealing these leak paths are blocked when the coating is removed over a certain distance and this is embedded in the sealing strip 74 . Again mechanical protection of the transition and strain relief of the fibres and ribbon is achieved.
  • FIG. 8 a patch cord termination is shown.
  • the cable assembly 80 is stripped down to expose the buffer 82 , strength members 84 , and the primary coated fibre 86 and the resulting transition zone is embedded.
  • the strength members 84 can be embedded in the strip 88 for fixation.
  • the primary coating can be removed from a fibre over a certain distance before embedding as shown for one of the fibres in FIG. 6 . This is optional but not essential to achieve a good sealing level.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Cable Accessories (AREA)
  • Glass Compositions (AREA)
  • Packages (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
US10/475,768 2001-04-27 2002-04-15 Optical fiber sealing Expired - Fee Related US6968113B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/227,581 US7046901B2 (en) 2001-04-27 2005-09-15 Optical fibre sealing
US11/377,147 US7149403B2 (en) 2001-04-27 2006-03-16 Optical fibre sealing assembly

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0110366.2 2001-04-27
GBGB0110366.2A GB0110366D0 (en) 2001-04-27 2001-04-27 Optical fibre sealing
PCT/GB2002/001745 WO2002088813A1 (en) 2001-04-27 2002-04-15 Optical fibre sealing

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/227,581 Continuation US7046901B2 (en) 2001-04-27 2005-09-15 Optical fibre sealing

Publications (2)

Publication Number Publication Date
US20040136678A1 US20040136678A1 (en) 2004-07-15
US6968113B2 true US6968113B2 (en) 2005-11-22

Family

ID=9913590

Family Applications (3)

Application Number Title Priority Date Filing Date
US10/475,768 Expired - Fee Related US6968113B2 (en) 2001-04-27 2002-04-15 Optical fiber sealing
US11/227,581 Expired - Fee Related US7046901B2 (en) 2001-04-27 2005-09-15 Optical fibre sealing
US11/377,147 Expired - Fee Related US7149403B2 (en) 2001-04-27 2006-03-16 Optical fibre sealing assembly

Family Applications After (2)

Application Number Title Priority Date Filing Date
US11/227,581 Expired - Fee Related US7046901B2 (en) 2001-04-27 2005-09-15 Optical fibre sealing
US11/377,147 Expired - Fee Related US7149403B2 (en) 2001-04-27 2006-03-16 Optical fibre sealing assembly

Country Status (18)

Country Link
US (3) US6968113B2 (es)
EP (1) EP1381898B1 (es)
KR (1) KR20040015158A (es)
CN (1) CN100335929C (es)
AT (1) ATE498851T1 (es)
AU (1) AU2002251289B2 (es)
BR (1) BR0209189A (es)
CA (1) CA2443720A1 (es)
CZ (1) CZ20032605A3 (es)
DE (1) DE60239195D1 (es)
ES (1) ES2359133T3 (es)
GB (1) GB0110366D0 (es)
MX (1) MXPA03009526A (es)
NO (1) NO20034791D0 (es)
PL (1) PL363082A1 (es)
RU (1) RU2312382C2 (es)
WO (1) WO2002088813A1 (es)
ZA (1) ZA200307417B (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002251289B2 (en) * 2001-04-27 2006-12-21 Tyco Electronics Raychem Nv Optical fibre sealing
US20070160339A1 (en) * 2002-05-20 2007-07-12 Kathleen Bellekens Optical fibre sealing
US20090159332A1 (en) * 2007-10-26 2009-06-25 Matthew Holmberg Cable seal assembly

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100374892C (zh) 2002-04-12 2008-03-12 泰科电子雷伊化学有限公司 光路封壳
GB0401998D0 (en) * 2004-01-30 2004-03-03 Tyco Electronics Raychem Nv Optical device
JP4933181B2 (ja) * 2006-07-19 2012-05-16 三菱電線工業株式会社 コネクタ付き光ファイバシートおよびその製造方法
US8622634B2 (en) * 2011-07-29 2014-01-07 Corning Cable Systems Llc Optical fiber assemblies and methods of fabricating optical fiber assemblies
CN110493995A (zh) * 2019-09-17 2019-11-22 迅达（中国）电梯有限公司 密封装置

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7816729U1 (de) 1978-06-03 1978-09-28 Rittal-Werk Rudolf Loh Gmbh & Co Kg, 6341 Rittershausen Schaltschrank mit Bodenplatte
US4135587A (en) 1975-12-08 1979-01-23 Raychem Corporation Cases for enclosing substrates
GB2153105A (en) 1983-12-19 1985-08-14 Raychem Sa Nv Terminating an optical fibre cable
US4954670A (en) 1986-02-24 1990-09-04 Raychem Corporation Cable splice case
EP0635193A1 (en) 1993-02-11 1995-01-25 Ericsson Telefon Ab L M A FLEXIBLE DEVICE FOR ENCLOSURE ELECTRONIC COMPONENTS.
JPH0763956A (ja) 1993-08-30 1995-03-10 Nec Corp 光ファイバ導入部の気密封止構造
US5416873A (en) 1994-05-05 1995-05-16 Advanced Custom Applications, Inc. Protector device for fused optical fiber joints and method of use
US5568584A (en) 1995-03-20 1996-10-22 Psi Telecommunications, Inc. Fiber optic closure with cable adapter spool
WO1998001783A1 (en) 1996-07-03 1998-01-15 Akzo Nobel N.V. Method for making a hermetically sealed package comprising at least one optical fibre feedthrough
WO1998021801A1 (en) 1996-11-15 1998-05-22 Minnesota Mining And Manufacturing Company Composite material splice closure for electrical cables
JP2000292642A (ja) 1999-04-02 2000-10-20 Nippon Telegr & Teleph Corp <Ntt> 光部品モジュール

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* Cited by examiner, † Cited by third party
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US3236015A (en) * 1961-07-11 1966-02-22 Rubenstein David System of fabrication of porous structural elements
JPH063956A (ja) * 1992-06-17 1994-01-14 Seiko Epson Corp 記録材料の残量検出装置
US6166367A (en) * 1998-03-26 2000-12-26 Photobit Corporation Programmable analog arithmetic circuit for imaging sensor
GB0110366D0 (en) * 2001-04-27 2001-06-20 Tyco Electronics Raychem Nv Optical fibre sealing
WO2002098112A2 (en) * 2001-05-29 2002-12-05 Transchip, Inc. Patent application cmos imager for cellular applications and methods of using such

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135587A (en) 1975-12-08 1979-01-23 Raychem Corporation Cases for enclosing substrates
DE7816729U1 (de) 1978-06-03 1978-09-28 Rittal-Werk Rudolf Loh Gmbh & Co Kg, 6341 Rittershausen Schaltschrank mit Bodenplatte
GB2153105A (en) 1983-12-19 1985-08-14 Raychem Sa Nv Terminating an optical fibre cable
US4954670A (en) 1986-02-24 1990-09-04 Raychem Corporation Cable splice case
EP0635193A1 (en) 1993-02-11 1995-01-25 Ericsson Telefon Ab L M A FLEXIBLE DEVICE FOR ENCLOSURE ELECTRONIC COMPONENTS.
JPH0763956A (ja) 1993-08-30 1995-03-10 Nec Corp 光ファイバ導入部の気密封止構造
US5416873A (en) 1994-05-05 1995-05-16 Advanced Custom Applications, Inc. Protector device for fused optical fiber joints and method of use
US5568584A (en) 1995-03-20 1996-10-22 Psi Telecommunications, Inc. Fiber optic closure with cable adapter spool
WO1998001783A1 (en) 1996-07-03 1998-01-15 Akzo Nobel N.V. Method for making a hermetically sealed package comprising at least one optical fibre feedthrough
WO1998021801A1 (en) 1996-11-15 1998-05-22 Minnesota Mining And Manufacturing Company Composite material splice closure for electrical cables
JP2000292642A (ja) 1999-04-02 2000-10-20 Nippon Telegr & Teleph Corp <Ntt> 光部品モジュール

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* Cited by examiner, † Cited by third party
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Great Britain Search Report for GB 0110366.2.
International Preliminary Examination Report for PCT/GB 02/01745.
International Search Report for PCT/GB 02/01745.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002251289B2 (en) * 2001-04-27 2006-12-21 Tyco Electronics Raychem Nv Optical fibre sealing
US20070160339A1 (en) * 2002-05-20 2007-07-12 Kathleen Bellekens Optical fibre sealing
US7447412B2 (en) * 2002-05-20 2008-11-04 Kathleen Bellekens Optical fibre sealing
US20090159332A1 (en) * 2007-10-26 2009-06-25 Matthew Holmberg Cable seal assembly

Also Published As

Publication number Publication date
US7149403B2 (en) 2006-12-12
US20060008236A1 (en) 2006-01-12
AU2002251289B2 (en) 2006-12-21
DE60239195D1 (de) 2011-03-31
RU2312382C2 (ru) 2007-12-10
ATE498851T1 (de) 2011-03-15
CA2443720A1 (en) 2002-11-07
WO2002088813A1 (en) 2002-11-07
CN1505766A (zh) 2004-06-16
KR20040015158A (ko) 2004-02-18
MXPA03009526A (es) 2004-02-12
US20060182408A1 (en) 2006-08-17
EP1381898B1 (en) 2011-02-16
PL363082A1 (pl) 2004-11-15
CN100335929C (zh) 2007-09-05
RU2003134363A (ru) 2005-02-27
NO20034791L (no) 2003-10-24
GB0110366D0 (en) 2001-06-20
US7046901B2 (en) 2006-05-16
BR0209189A (pt) 2004-08-03
ZA200307417B (en) 2004-09-23
CZ20032605A3 (cs) 2004-01-14
US20040136678A1 (en) 2004-07-15
EP1381898A1 (en) 2004-01-21
ES2359133T3 (es) 2011-05-18
NO20034791D0 (no) 2003-10-24

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